#include "key.h"
unsigned char key()
{
	unsigned char Key_Count=0;
	if(P3_1==0){Delay(20);while(P3_1==0);Delay(20);Key_Count=1;}
	if(P3_0==0){Delay(20);while(P3_0==0);Delay(20);Key_Count=2;}
	if(P3_2==0){Delay(20);while(P3_2==0);Delay(20);Key_Count=3;}
	if(P3_3==0){Delay(20);while(P3_3==0);Delay(20);Key_Count=4;}
	return Key_Count;
	
}